Here's a list of top articles on asynchronous programming from the Visual Studio 2012 documentation on MSDN, as recommended by the documentation writers:
Asynchronous programming in C++ (Windows Store apps)
Asynchronous programming in JavaScript...

Read Soma's announcement, which includes instructions on how to get the new releases, here .
Read what Jason Zander has to say about the releases, including a list of the top 12 enhancements, here .
For a thorough summary of what's new, go here...

Today Soma announced that the final builds of Visual Studio 2012 and .NET Framework 4.5 are complete, and that, for MSDN subscribers, the builds will be available for download on August 15th. See his blog post here .